Improvement in air-tight frankun stoves



R. D. GRANGER.. AIR TIGHT FRANKLIN -sToI/'II No. 7,973. Patented Mar.lull 17851.

UNITED' STATES PATENT OFFICE.

E. D. CHANGER, or ALBANY, ,NEWv YORK. 1

Specification forming p'art'of Letters Patent No;V 7,973, dated March11, `185] To ctZZwhom, it maylcoitcern:

Beit known that I, RENssELAER D. GRAN GER, of Albany cityQand county, inthe State of vNew York, -have invented a new and Improved Parlor-Stove,which I callfGrangers. Air-Tight Franklin Stove#7 -and I do herebydeclare that the followingis a fu1l,..clear, and exact-description ofthe same, reference being had to the accompanying drawings, makingYpartei' thisr specification, in which- Figure 1A shows a cross orprofile .section `through the middleof the stove; Fig. 2, a pervspective view ofthe stove with the front opem The first Apart of myinvention consistslin making the front and back of thefre-box'of closedmetalplates to. form a hot-air chamber in front and one'behind, with thebottom-prof vided with a grate occupying about one-third of the area,from thefront to back, and" provided with a damper to close the wholegratesurface or any part thereof, whereby the supplyofair to passthrough the grate can be regulatedv to suit the draft ofthe chimney andthe amount of combustion-required, or be entirely cut oif,- so that aslow combustion can be maintained in the fire-chamber by a. supply ofoxygen fromfabove, on the principle of what is knownras theair-tightfstove. The front and back plates ofthe said fire-box, while.

they are employed to form `andre-box with but a small proportionalgrate-surface, at the same time constitute the linner plates of twoairchambers, so that the air entering therein from the room will beheated by radiation.'

The second part of my invention cons-ists in combining with afire-box-such as above described-havin g a grate at the bottom governedby a damper, vertically-sliding doors in front andtabove thefire-chamber, whereby the supply of air from the' room to theiniiammable products of the combustion of the fuel in the lire-pot canbe regulated and directed at pleasure. The effect of the said slidingdoors -in front is at the saine time such as to admit of a ready meansof regulating the height and capacity ofthe front aperture, that thestove may be used as an open Franklin without smoking.

In the accompanying drawings, A A A A curvilinear or inclined frontandback plates, a a b b, rounding or slanting. from the horizontal lowerlines' of the front opening of the stove down-to the grate`B,.whi'e hoccupiesa space at or near thecenter of the `lower part .of the stove,and is a little less than one-third of the width of the stove inbreadth, extend.- ing from side to side thereof in its length, and isplaced at the usual height `fromthe bottom of the stove, so A*as toallow a suicient ash- -V pit, C, beneath the grate.V l

The damper is asliding plate, ff, 'arranged to be, when not used, in thespace between the back edgeV of the grate 'and-1 the back plate of thestove,,(or front edge and front plate, if preferred,) and when lpushedout vfrom there- 4 cess by its handle y is capable of closing airtightthe said spaces of the grate and lire-box.

I arrange a sliding door or portcullis, h'h, moving verticallyy injagroove or recess in the jambs of theropen front, and continuing behindthefront plate of the stove; AThe door, whendrawn up,"lies behind thefront plate, as shown in Fig. 2, and when dropped down Vcloses the frontopening, 'as shown in Fig. 1. The door can be set to any desired heightby means of a little dog or pawl hinged to a projection of ,the slidingdoor, which protrudes through alslot in the center of the front plateand. catches into teeth cut in the side moldings'of theslot, as shown inFig. 3.

The iiueF. is constructed by throwing the upper back plate, 7;, of thenre-box with a slope forward from thefuel-receptacle at d,

and upward for a short distance, when with a curve itturns upward andbackward toward the rear ofthe upper part of the stove, where the iiuepassesthrough the ytop or upper part of the back'plate. The front partof the flue is a plate, which starts from the top' of the front openingof the stove at m and turns with a gradual curve toward the rear, slowlyapproaching the back plate till it reaches the exit-passage of the line.the flue leaves vacant spaces between it and the top, front, rear, andsides of the stove, which is constructed of plates perforated withopenings, after some ornament-al design, permitting free radiation ofheat from the flueplates.

It will beobserved from the drawings tha-t vsimilar spaces lie betweenthe receptacle for fuel and the'vfront and back plates, also cov g Thisdisposition of v .become heated, pass out andA circulate through theroom.

When the lstove isfto be used as an open Franklin, the front door is tobe'drawn up, -and the bottom may be drawn out. Dropping the door andclosingthe damper under the grate converts the open Franklin intoanair-tight Franklin;

By partially opening the front door and set-- ting Iit at any desireddegree the draft of the 'stove may be managed at pleasure.

The great objection to Franklin'stovcs heretofore made has been theirliability to smoke when Without doors, or with doors swinging on hinges,since the quantity of air admitted could not be controlled to meet the'capacity' of the stove-and ilues, and the smoke would escape from thestove. My object in the construction-'oi' this Franklin is lto obviatethis difficulty, and at the same time so to construct and combine myimprovements that the `open Franklin may be converted at pleasure intoan air-tight stove for economy in fuel and safety and convenience inuse. y

What I claim as my invention, and desire to secure by Letters Patent,is-

'1., Making the fire-box with closed plate in front and behind, with agrate-surface at bottom occupying about one-third of the space betweenthe front and back stove-plates to constitute Ahot-air chambers frontand back, when such fire-box is. combined with a sliding damper atbottom, substantially as and for the purpose specified. Y

2. In combination with a hre-chamber constructed as above specifi-ed,and governed at bottom with a sliding damper, as specied, the open frontwith vertically-sliding doors, as described, and for the purposespecified.

BENssELAER D. GRANGER.

Witnesses:

ALEX. PORTER BRoWNE,

BISHOP.

